Created
February 28, 2021 11:21
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Macro Testing (macro)
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| package ajr.scala3test | |
| import scala.quoted.* | |
| import upickle.default.Writer | |
| def callImpl(obj: Expr[MyObject], argsExpr: Expr[Seq[Any]])(using Quotes): Expr[String] = | |
| import quotes.reflect.report | |
| argsExpr match | |
| case Varargs(argExprs) => | |
| val argShowedExprs = argExprs.map { | |
| case '{ $arg: tp } => | |
| val str = Type.show[tp] | |
| println(s"matched arg=$arg str=$str") | |
| Expr.summon[Writer[tp]] match | |
| case Some(showExpr) => | |
| '{ upickle.default.write($arg)($showExpr) } | |
| case None => | |
| report.error(s"could not find implicit for ${Type.show[Writer[tp]]}", arg); '{???} | |
| } | |
| val newArgsExpr = Varargs(argShowedExprs) | |
| '{ "[" + $newArgsExpr.mkString(",") + "]" } | |
| case _ => | |
| report.error(s"Args must be explicit", argsExpr) | |
| '{???} |
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